I wouldn't bother with Poring Tower for only one skill up. Only worth it if you're working on multiple things at once.
I did challenge 7-9 and I can confirm it is indeed challenge 1. Reward is the same as JP challenge 10 though.
It's not...
This is Challenge 15 data from PAD Guide. Levels and rewards are the same as what we have right now, except for JP stripped +9 from Tamadra in later challenges. Haven't run level 4 to see what ours drops yet. (Oh, duh, they listed it as a +9. Well, that's the only difference I can spot that would make this not Ch15.)
It's mostly an academic distinction, but I'd rather PADX and Guide would just link this for the info instead of butchering the old Challenge 1 data. I doubt GungHo went through the trouble of recoding a challenge when they could simply push this one ahead out of order.
Looking forward to see what ultimates for chibi Valk and Ronia are. Valk is already quite good, but chiRonia is worthless. Love to see her go in a new direction by dropping rows for TPAs and at least one skill boost.
8* bikini Valk in summer REM is horrible news. What's the minimum roll count for that, 500 rolls? A thousand? If this is some stupid half measure to avoid pushing MP shop to NA now, expect some rage.
What would be the best way to farm + eggs? The rate is 5x so I'd like to give it a try.
You missed the 3x normals plus egg event last time? That's better than 5x tech by far, especially when running Ocean of Heaven Sea God or Starlight Sanctuary King of the Gods. If you want to run 5x still, Mondays are usually the best day to farm since technical dungeons all get 1.5x drop rate bonus that day. Forbidden Tower Door of Light and Shadow is usually recommended, but if you're still clearing dungeons normally or in challenge mode, might as well keep doing that. Outside Mondays and FT, the technical versions of Mechdragons are probably the best source of plus eggs during 5x.